Tohkemy Corporation
Tohkemy Sigma Chemical Pump


Manufacturer: Tohkemy Corporation
Model: Sigma
Features
Control type
The control type is a motor-driven diaphragm type metering pump with a built-in inverter.
External input signals synchronize the system to deliver precise, single-stroke metering, replicating the responsive control interface of a solenoid-driven pump.
Additionally, a new three-speed stroke velocity controller allows process technicians to tailor discharge dynamics across a wide spectrum of chemical injection profiles.
Basic type
Standard model driven by a general-purpose motor.
Can be changed to standard / cheap / pressure-resistant explosion-proof / inverter motor drive type. (There are no sigma control type functions)
Not only domestic specifications but also overseas specifications (IEC standard, NEMA standard) can be supported.
Specification
Lineup
| Series | Discharge rate (L/min) | Discharge pressure (MPa) |
|---|---|---|
| Sigma 1 (S1Cb/Ba) | 0.33 – 1.95 | 0.4 – 1.2 |
| Sigma 2 (S2Cb/Ba) | 0.93 – 5.86 | 0.4 – 1.0 (1.6) () Indicates SST |
| Sigma 3 (S3Cb/Ba) | 3.03 – 17.3 | 0.4 – 1.0 (1.2) () Indicates SST |
<Power supply>
Control type:100-230VAC ±10% 50/60Hz
Basic type: 3-phase 200V 50 / 60Hz, special specifications conform to the mounted motor
<Protective structure>
IP65 / 44 (For outdoor installation, avoid direct sunlight, wind and rain)
<Installation environment>
Non-explosion-proof area
Wet contact material
| Name | Pump head | Connector | Diaphragm | O-ring | Check ball |
|---|---|---|---|---|---|
| PVT | PVDF | PVDF | PTFE | PTFE | ceramic |
| SST | SUS316L | SCS22 | PTFE | PTFE | SUS316 |
Wetted Parts (All Models)
Materials: PVDF or SUS316L heads for high chemical resistance.
Safety: Multi-layer diaphragm with standard leak/damage detection.
Viscosity: Handles up to 200 mPa·s standard; up to 500 mPa·s with optional Hastelloy C valve springs.
Connections: Supports standard insert, flange, and hose nozzle connections.
Control Modes (Control Type Only)
Pulse: Standard (1:1), division (1:N), or multiplication (N:1) modes ($N = 0.01\text{–}99.9$) for proportional injection with pulse flow meters.
Batch: Injects a pre-set stroke count via local button or external signal, then auto-stops.
Analog: Proportional speed control via 0/4–20mA DC, including direct pH meter signal control.
3-Step Stroke Speed Modes (Control Type Only)
Normal: Standard sine wave (uniform suction/discharge).
Suction Low-Pulsation: Slows suction stroke for stable intake of high-viscosity fluids.
Discharge Low-Pulsation: Slows discharge stroke to minimize line pulsation.

<Flow monitor (optional)>
By installing an optional flow monitor separately, the discharge status for each stroke can be monitored.
<External output relay (optional)>
It is possible to output an alarm signal and a paging signal for each stroke.
Discharge amount can be output with 0 / 4-20mA DC.
<Click wheel type operation panel>
With standard 0.5m cable. A cable length of 2, 5 or 10 m can be selected as a normal option.

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